Heater core flush

This is a discussion on Heater core flush within the How To Section forums, part of the Ford Expedition Forum category! I need to clean and flush my front heater core because of poor heat the rear heat is perfect. Does ...

I need to clean and flush my front heater core because of poor heat the rear heat is perfect. Does anybody no how to isolate the rear heater core so I can just clean the front. Do I just need to turn temp control to cold on rear to do this? Thanks for any help